.studyd {
  .a {
    padding: 10px 10px 0 10px;

    .cell {
      display: block;
      height: 158px;
      background-repeat: no-repeat;
      background-size: contain;
      background-position: center;
      border-radius: 5px;

      &.bg_01 {
        background-image: url("./images/a.jpg");
      }

      &.bg_02 {
        background-image: url("./images/b.jpg");
      }
    }
  }
}